/*字体样式*/
.my-font{
    font-style:italic;
    font-weight: bolder;
    font-size: 2.75em;
    font-family: 宋体 ;
    /*line-height: 5em;*/    /*  5*font-size(2.75em)=5*2.75*16px=220px   */
    line-height: 5rem ;    /*5px*16=80px*/
}
.my_text{
    border: 1px solid black;
    width: 30rem;
    height: 10rem;
    letter-spacing: 1rem;
    line-height: 2rem;
    text-indent: 1rem;
    text-align:center;
    vertical-align: middle;
}
.my_color{
    border:1px solid black;
    width: 30rem;
    height: 10rem;
    color: blue;
}
.my_bg{
    border:1px solid black;
    width: 50rem;
    height: 20rem;
    background: #c82333 url("https://www.baidu.com/img/bd_logo1.png") no-repeat -30px -90px;
}
.my_list{
    list-style-type: circle;
    list-style-image: url("https://ss2.baidu.com/6ONYsjip0QIZ8tyhnq/it/u=140509601,2799223051&fm=58");
}
.my_box{
    width: 50rem;
    height: 20rem;
    border: 1px solid black;
    margin: 1rem 1rem ;
    padding: 1rem;
}